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The history of scientific thought about the formation and evolution of the Solar System began with the Copernican Revolution. The first recorded use of the term "Solar System" dates from 1704. [1][2] Since the seventeenth century, philosophers and scientists have been forming hypotheses concerning the origins of our Solar System and the Moon ...
The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga. [2]: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, [34] [35] [36] soon after the formation of the Earth's crust and the Earth
Quizlet is a multi-national American company that provides tools for studying and learning. [1] Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards, matching games, practice electronic ...
For the first time, our nation's American flag was flown in battle, on this day in history, Sept. 3, 1777, during a Revolutionary War skirmish at Cooch's Bridge, Delaware. Here's the background.
The history of the United States from 1917 to 1945 was marked by World War I, the interwar period, the Great Depression, and World War II. The United States tried and failed to broker a peace settlement for World War I, then entered the war after Germany launched a submarine campaign against U.S. merchant ships that were supplying Germany's ...
The term Coelomate means having a body cavity (coelom) containing the internal organs. Most of the phyla featured in the debate about the Cambrian explosion [clarification needed] are coelomates: arthropods, annelid worms, molluscs, echinoderms, and chordates – the noncoelomate priapulids are an important exception.
Reconstruction of a Neolithic farmstead, Irish National Heritage Park.The Neolithic saw the invention of agriculture.. The Neolithic or New Stone Age (from Greek νέος néos 'new' and λίθος líthos 'stone') is an archaeological period, the final division of the Stone Age in Europe, Asia, Mesopotamia and Africa (c. 10,000 BC to c. 2,000 BC).
Protohistory is the period between prehistory and written history, during which a culture or civilization has not yet developed writing, but other cultures that have developed writing have noted the existence of those pre-literate groups in their own writings. Protohistoric may also refer to the transition period between the advent of literacy ...